Safety device for the locking and actuation of electrical connectors provided in extractable drawer for mcc cabinet

ABSTRACT

A safety device developed to promote more security and better efficiency in its use is provided to operate in the locking and actuation of electrical connectors positioned in extractable drawers for MCC cabinets, thereby setting a safety device capable of connecting or disconnecting the internal connectors, both principal and test connector, provided in the extractable drawer for MCC cabinet, the procedure is executed mechanically through an assembly of elements that interconnect two thin laminar plates and, these in turn, interconnected to each other, positioned inferiorly and of conformations corresponding to promote a perfect fit.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims priority to PCT Application No.PCT/BR2015/000043, having a filing date of Mar. 26, 2015, based onBrazilian Application No. 10 2014 0075623, having a filing date of Mar.28, 2014, the entire contents of which are hereby incorporated byreference.

FIELD OF TECHNOLOGY

The following is related to a device notably developed to promote moresecurity and better efficiency in its use, i.e., to operate in thelocking and actuation of electrical connectors positioned in extractabledrawers for MCC cabinets, thereby setting a safety device capable ofconnecting or disconnecting the internal connectors, both main and testconnectors, provided in the extractable drawer for MCC cabinet, saidprocedure is executed mechanically through an assembly of elements thatinterconnect two thin laminar plates, these in turn, interconnected toeach other, positioned inferiorly to the body of the drawer and withconformations corresponding to promote a perfect fit.

The safety device for locking and actuation of electrical connectorsarranged in extractable drawer for a MCC cabinet, is particularlybelonging to the field of safety devices for the actuation and/orlocking of electrical equipment, said device of external operation withthe door closed, promotes protection to operators of extractable drawersin MCC cabinets.

BACKGROUND

As known by the professionals of the industry and commerce of electricalequipment, particularly electrical cabinets of MCCtype (Motor ControlCenter), the referred MCC cabinets configure a handling and loadingcontrol system, especially of electrical motors of low or middlevoltage.

The MCC cabinets are currently divided into areas that accommodateequipment for protection, sectioning and handling of loads, whichpresent important function in the distribution systems of electric powerin commercial and industrial units. Exactly where the cables from theloads are connected.

Although most of the industrial loads are formed by motors, reason ofthe name MCC (Motor Control Center), the term “loads” is quite generaland can mean any equipment that consumes electrical energy, such asgreenhouses, resistors and other correlated equipment, being its useintended to industrial installations presenting a plurality of loadsthat must be commanded, in which a maximum continuity of operation mustbe assured, and where the access of unskilled personnel is necessary, oralso, in which is required a high level of safety for operators andmaintenance personnel.

The MCC cabinets are made of metallic material, self-sustained,simplified or armored, which may be of TTA-type (Totally TestedAssembly), or PTTA-type (Partially Totally Tested Assembly).

In the TTA concept, the performance is assured by tests carried outindividually in the plurality of components (bus, inputs, outputs,feeders, motor starters, etc.) or in the complete assembly.

These tests have the purpose of ensuring the performance of the assemblyand minimize the risks caused by errors of the projects.

On the other hand, in PTTA-type, only some components are assayed andtested.

Therefore, the referred cabinets are formed by drawers which can befixed or extractable.

The extractable drawers are specific for a safer operation and fastermaintenance, mostly in cases of replacements during the operation.

The MCC cabinets are designed with a high standardization index,facilitating the assembly, installation and maintenance, besidesallowing expansions and interchangeability between drawers of the sameMCC cabinet model and of the same dimensions and functions.

The MCC cabinets have functions of mechanical and electricalinterlocking, protection against the touch of living parts, totalinterlocking of contactors, metal divisions which prevent arcpropagation, besides of providing safety of personal, operation andmaintenance.

At the beginning, the MCC cabinets were not compartmentalized, i.e.,they were provided with a single mounting plate, where the protectionand the handling assemblies of individual loads were mounted together inthis same plate; this solution is known as a conventional electricalcabinet.

On the other hand, in the compartmentalized MCC cabinets, the safety andhandling equipment of each individual load are mounted in isolatedcompartments inside of the same panel. This MCC cabinet can be fixed orextractable.

In the fixed MCC cabinet, particularly inside each compartment ismounted a fixed mounting plate, where the equipment for safety andhandling of the start are positioned.

Meanwhile, in the extractable MCC cabinet, particularly inside eachcompartment is mounted a drawer, which can be removed from the panelwithout the assistance of tools, such as levers or cranks, a commonmeans of extraction for a long period of time.

The equipment for safety and handling of the starts are mounted insidethe drawers, minimizing the downtime, since in this way, is possible toquickly replace the drawers.

The MCC cabinets are essential assemblies for the production, and withthe advancement of technology and the need for the monitoring and thecontrolling of production, the use of networks is a solution thatenables to reduce the downtime from hours to minutes, with a better andmore complete diagnostics, by means of supervisory systems which locateaccurately the problematic points during the production process, makingit possible to know in what and where intervene and correct.

The prior art provides some models of extractable drawers for MCCcabinets, wherein each one is provided with a means other thanextraction and reinsertion in the MCC cabinet, in addition to provide ahandling, locking and actuation means of the electrical connectors.

After a brief search in the world patent banks, several documents ofimportant relevance were found, among which the PI 0700143-6 filed onApr. 1, 2007, under the title, “SLIDING CONNECTION DEVICE OF EXTRACTABLEDRAWER IN ELECTRICAL PANEL”, which refers to a sliding connection devicefor connecting a extractable drawer to a bus bar of main power of anelectrical panel, comprising a section fixed to the drawer and a slidingsection associated to said fixed section. The fixed section is providedwith terminals to which the power cables are connected and the slidingsection is provided with electrical contacts for connecting to the powerbus bar, and that between said fixed section and said sliding section isarranged at least one movement course in the form of a groove and atleast one intermediate contact performing the physical and electricalconnection between said sections.

Thus, the device is capable of moving itself for coupling or uncouplingto the power bus bar in such a way that only the sliding sectionperforms this movement, while the fixed section and the power cablesassociated to it, remain immovable.

Further documents are described below, namely, DE102008046881,DE19504474 and FR2126117.

The document DE102008046881, filed on 18 Mar. 2010, provides a modulethat has a locking unit and a contact switch unit with multiple contactswitches, where the contact switches are operated by the locking unit,and where the locking unit and the contact switches are arranged inupper housings or on a housing carrier.

Two actuation components in the form of key holders are provided in thelocking unit, being the module movable between a separating position andan operating position by the actuation components.

The contact switches are in contact with the bus bars in the operatingposition.

The second document, DE19509474, filed on 19 Sep. 1996, discloses aswitching device that provides a number of shelves for holding bus barscoupled to the drawers, wherein for each bus bar there are contactsliders, and each of these has a rigid contact rail.

There is still a mechanism to bring the rack into contact or withdrawit, and the contact sliders and rails are on the back side of the rack.

All the contacts of one rack are operated by the same mechanism,positioned on the front side of the rack.

The contact sliders have grooves perpendiculars to the sliding directionin which a comb-like coupling element is positioned, joining to theoperating mechanism and, finally, each contact slider has two springcontacts, between which the bus bar fits.

The third document, FR2126117, filed on 26 Feb. 1971, relates to theembodiment of a mechanical coupling system for a locking position of twoobjects, and afterwards its release or disengagement, being this effectpossible due to the use of two appropriate levers, where its commandscan be simultaneous or not, and may be even used in junction ofconnectors, drawers, cabinets, power modules, etc.

The prior art further discloses the document AU2002252966, filed on 17Feb. 2005, which refers to a low voltage switchgear comprising anappliance module for receiving appliances according to the switching,control and protection technology. A locking bar comprising laterallyprojecting bolts is arranged in a housing of the appliance module,perpendicularly in relation to the direction of displacement.

Positioning cranks are arranged on lateral edges of the bottom of asection, the bolts co-operating with said positioning cranks in order tolock the appliance module in an operating, separating and test position.

A lifting gear is used to lift the locking rod in its working position,said lifting gear being actuated by means of a control unit which isarranged on an operating face.

The test position is held if a separation auxiliary contact is locked inthe separation position of the appliance module.

Another document is U.S. Pat. No. 7,791,862, filed on 19 Jun. 2008 andrefers to an electrical switching system comprising a housing andcomponents which are arranged therein and which are embodied as acontrol and/or measuring unit.

Said components are arranged in modular-type drawers.

A base module comprises at least one module support profile, in additionto lateral walls and front sided insertion elements.

One front wall of the base module, preferably the front side thereof, isformed by a control unit and the opposite front wall of the measuringunit, and the dimensions of the control and measuring unit are adaptedto the size of the module.

Nevertheless, the most modern and used type of extractable drawer in theprior art is still to be mentioned herein, and is configured by a typeof extractable drawer equipped with a safety system which has twoactuation and locking keys of the assemblies, being one smaller thatactuate the connectors of the test command and one larger that actuatethe connectors to the power input of the system, i.e., coupling theconnectors to the bus bars, which actuates all the equipment connectedtherein.

First, it is worth mentioning that in this type of extractable drawer,the procedure that the operator uses to verify the functioningconditions of the system takes place from the actuation or rotation ofthe lower command, which is conformed by a special short key, thatmechanically actuate the test device of the system.

After verifying the conditions of the equipment that will be actuated,when the operator rotates the special short key in reverse, the testdevice of the system will be de-energized.

Thus, after withdrawing the special short key, an elongated key isinserted in the same hole, actuating also by rotation, the equipment,being this actuation executed through a mechanical device provided witha plurality of rods, turnstiles and joints, which interconnects theactuating means of the equipment, pressing the clutches of theextractable drawer, connecting them to the bus bars that energize theequipment.

The device described above is what there is of most modern used by theconsumer public. However, the referred device also presents someinconvenience among which the need of using two keys for the actuationof the test and operation of the equipment.

Another important inconvenient is due to the number of components usedfor the full operation of the device, where the fatigue or failure ofany of the component elements of this device, may cause the malfunctionor still the total locking of the aforementioned safety device.

SUMMARY

An aspect relates to a safety device for the locking and actuation ofelectrical connectors provided in extractable drawer for mcc cabinet,which should be positioned with total distinction among its similar andbe customized before the consumer market by the fact of presenting adevice developed to promote more safety in its use, i.e., to actuate inthe locking and actuation of electrical connectors positioned in theextractable drawers for MCC cabinets, thereby setting a safety devicecapable of connecting or disconnecting the internal connectors alongwith their respective bus bars, both the main connector and the testconnector, arranged in an extractable drawer for MCC cabinet, saidprocedure is executed mechanically through an assembly of elements thatinterconnects two thin laminar plates, these in turn are interconnectedto each other, positioned inferiorly and of conformations correspondingto promote a perfect fit. The mechanical actuation of the elements ofthis assembly is performed externally with the door closed, from theactuation of a main key which actuates a pendulum, which moves anassembly of gears suitably arranged in the extractable drawer for MCCcabinet, which in turn moves the lower laminar plates, connecting thetest device and posteriorly the connectors, wherein said connectors,when in contact with their corresponding bus bars, energize theequipment in which they are connected.

BRIEF DESCRIPTION

Some of the embodiments will be described in detail, with reference tothe following figures, wherein like designations denote like members,wherein:

FIG. 1 shows a top view, in perspective, of an embodiment of anextractable drawer for MCC cabinet, illustrating the door of theextractable drawer, the safety device, the gear assembly and themovement transmission that interconnect the connectors and the bus bars;

FIG. 2 shows a top view, in perspective of an embodiment of theextractable drawer for MCC cabinet, illustrating the door of theextractable drawer opened, showing the autonomous safety device coupledto the door, the gear assembly and the movement transmission elementsthat interconnect the connectors and the bus bars;

FIG. 3 shows a top view, in perspective, of an embodiment of theextractable drawer for MCC cabinet, illustrating the door of the draweropened, showing the back face of the autonomous safety device coupled tothe door, the gear assembly and the orthogonal laminar tabs of themovement transmission elements that interconnect the connectors and thebus bars;

FIG. 4 shows a top view, in perspective, of an embodiment of theextractable drawer for MCC cabinet, illustrating the gear assembly andthe orthogonal laminar tabs of the movement transmission elements thatinterconnect the connectors and the bus bars;

FIG. 5 shows a bottom view, in perspective, of an embodiment of theextractable drawer for MCC cabinet, illustrating the gear assembly andthe movement transmission elements that interconnect the connectors andthe bus bars, mechanically protected;

FIG. 6 shows a top view, in perspective, of an embodiment of the safetydevice, the gear assembly and the laminar plates provided withorthogonal tabs of movement transmission that interconnect theconnectors and the bus bars;

FIG. 7 shows a front view, in perspective and exploded, of an embodimentof the gear assembly, showing each internal set of gears;

FIG. 8 shows a rear top view, in perspective, of an embodiment of thegear assembly;

FIG. 9 shows a bottom view, in perspective, of an embodiment of the gearassembly;

FIG. 10 shows a front view of an embodiment of the gear assembly;

FIG. 11 shows a bottom view, in perspective, of an embodiment of thegear assembly;

FIG. 12 shows a perspective view of an embodiment of the door lockassembly of the extractable drawer for MCC cabinet; and

FIG. 13 shows a perspective exploded view of an embodiment of the doorlock assembly of the extractable drawer for MCC cabinet.

DETAILED DESCRIPTION

In accordance with the aforementioned illustrated figures, the followingrefers more particularly to a safety device 1 notably developed topromote the connection and disconnection of the internal connectors withthe corresponding bus bars 12, both the main power connector thatactuates the main equipment and the test connector are arranged in theextractable drawer 4 for MCC cabinet 16 of multiple compartments 17,with mechanical movement of the elements provided in the safety device1, which takes place externally with the door closed, from the movementof a special actuation key 2 that is provided with an autonomous safetydevice which in turn actuates a pendulum, that moves the gear assembly 6suitably arranged on the front section of the extractable drawer 4 forMCC cabinet 16, immediately behind the safety device 1, wherein saidsafety device 1 actuates the gear assembly 6, which in turn move thelower laminar plates 5 and 5A actuating the test connector andsubsequently the main connectors, being that the main connectors, whenin contact with their corresponding bus bars 12, energize the equipmentin which they are connected.

The laminar plates 5 and 5A are strategically positioned on the lowerface of the extractable drawer 4 for MCC cabinet 16 and are providedwith a plurality of small oblong cutouts 18 wherein small guide pins 19are fitted and arranged in the base 20 of the extractable drawer 4,which is formed in a single piece, said guide pins 19 delimit themovement of these plates 5 and 5A.

Furthermore, said plates 5 and 5A are provided with at least two smalllaminar tabs 14, which are orthogonal extensions of the plates 5 and 5Athemselves, being these orthogonal to its plane and inserted in guidecutouts 21, pressing the connectors provided on the extractable drawer 4towards their corresponding bus bars 12.

The laminar plates 5 and 5A are provided with also a plurality of smallrectangular cutouts 22 aligned with each other and passible of receivingthe gear teeth provided in the gear assembly 6, by moving the laminarplates 5 and 5A to connect or disconnect the connectors of the bus bars12.

As stated above, the procedure is performed mechanically through atleast one gear assembly 6 which interconnect the safety device 1 withthe thin and inferior laminar plates 5 and 5A, these in turn areinterconnected to each other, being positioned inferiorly and ofcorresponding conformations, the larger laminar plate 5 moves theconnectors toward the corresponding bus bars 12, energizing thereforethe entire system and, in addition, a smaller laminar plate 5A isprovided corresponding to the first larger laminar plate 5, being saidlaminar plate 5A actuated before the larger laminar plate 5, so that afunctioning test is performed in order to release the operation of themain equipment for use.

The test device is actuated on the first movement of the actuation key 2of the extractable drawer 4, concomitant with pressing the lockingdevice 3, without which the actuation key 2 does not rotates, connectingthe test device of said extractable drawer 4 and verifying the properfunctioning of the system as a whole.

Subsequent to the actuation of this test device, through a new movementof the actuation key 2, along with a new actuation of the locking device3, it will be possible to actuate the main connectors, energizing allthe equipment connected therein.

The same reverse procedure occurs at the system shutdown, when theactuation key 2 should move conversely.

Thus, the referred safety device 1 allows the actuation of the systemonly in a secure environment, i.e., the actuation of the main equipmentoccurs only sequentially through an actuation key 2, wherein the testdevice is actuated first by means of the special actuation key 2, whichhas specific conformation, in order to actuate the main equipmentposteriorly, so that in the event of any malfunction found in theequipment, whether electrical or mechanical, the first connectordesigned for testing, is passible to receiving an electric chargesubstantially lower than the main power, minimizing or even eliminatinginconvenience arising from malfunctions in the electrical system or inthe equipment itself.

The connector of test of the system functioning is released, primarilythrough the actuation key 2 that actuates the connectors of the testcommand and, then, the entire system is released through the sameactuation key 2, actuating the main connectors in the bus bars 12 of theelectrical system of the equipment coupled to the MCC cabinet 16,turning on all the equipment, being that these two steps, the actuationof the test device and the actuation of the main connectors, occur inthe front of the extractable drawer 4 locked in the “closed” position.

The unlocking of the extractable drawer 4 occurs in the actuation of thetest command and, posteriorly and in the sequence, the main connectioncommand of the bus bars 12 of the system is actuated and, at thismoment, the latch locks the front of the extractable drawer 4.

Thus, to better illustrate the functioning steps of this system,following is a table showing the moving and connection steps of the busbars 12 of the extractable drawer 4.

TABLE 1 PHASE PROCEEDING FUNTION OBS 1° PRESS THE LOCKING CONNECT THETEST THE DOOR 13 OF DEVICE 3 AND DO SOCKET, BLOCKING THE THE FIRSTROTATION AUTOMATICALLY EXTRACTABLE OF THE SPECIAL THE ADVANCE TO DRAWER4 IS ACTUATION KEY 2, THE NEXT STEP CLOSED AND MOVING THE FIRST LOCKED,SMALL LAMINAR PASSIBLE OF PLATE 5A, WHICH IS BEING OR NOT RESPONSIBLEFOR OPENED BY THE CONNECTION MEANS OF THE OR DISCONNECTION MOUNTING OFTHE TESTSOCKET CONDITION SELECTED 2° PRESS THE LOCKING CONNECT THE THEDOOR 13 OF DEVICE 3 AND DO POWER SOCKET FOR THE THE SECOND THECONNECTION OF EXTRACTABLE ROTATION THE BUSBARS, DRAWER 4 IS(SEQUENTIAL), BLOCKING CLOSED AND MOVING THE AUTOMATICALLY LOCKED,UNABLE SECOND LARGE THE ADVANCE TO TO BE OPENED IN LAMINAR PLATE 5, THENEXT STEP THIS CONDITION WHICH IS (ENERGIZED) RESPONSIBLE FOR THECONNECTION OR DISCONNECTION OF THE POWER SOCKET 3° PRESS THE LOCKINGDISCONNECT THE THE DOOR 13 OF DEVICE 3 AND DO POWER SOCKET, THE THESECOND DISCONNECTING THE EXTRACTABLE INVERTED BUSBARS AND DRAWER 4 ISROTATION BLOCKING CLOSED, PASSIBLE AUTOMATICALLY OF BEING OPENED THEADVANCE TO THE NEXT STEP 4° PRESS THE LOCKING DISCONNECT THE THE DOOR 13OF DEVICE 3 AND DO TEST SOCKET, THE THE FIRST INVERTED BLOCKINGEXTRACTABLE ROTATION AUTOMATICALLY DRAWER 4 IS (SEQUENTIAL) THE ADVANCETO CLOSED, PASSIBLE THE NEXT STEP OF BEING OPENED

More specifically, the safety device 1 for the locking and actuation ofthe electrical connectors arranged in an extractable drawer 4 for MCCcabinet 16, presents a degree of protection IP40 to IP55 and theircompartmentalization forms up to 4B, in accordance with the NR10requirements.

The sealing and locking of the extractable drawer 4 through a padlock orother equivalent locking means are also possible when the compartment isempty, due to the operating system of the extractable drawer 4 coupledto the door 13.

The positioner presents a specific encoding and has been developed fordifferent types of extractable drawers 4.

On the other hand, the modular socket of command and the lateral or backnetwork provide flexibility to the use of different types of connectors,such as PROFIBUS, ETHERNET, or output of power up to 100 A, etc.

The working mechanism of the extractable drawer 4 occurs throughoriented gears and operates sequentially through mechanical interlocks.

In this way, in order to access the interior of the extractable drawer4, to be possible to turn on or off the equipment connected to the MCCcabinet 16, to perform maintenance, among others, first, the actuationkey 2 is inserted, positioning the system in the test mode, turning onthe test command which can occur with the door 13 opened or closed orstill, optionally only with the door 13 closed.

Subsequently, the actuation key 2 of the main equipment is actuated,remembering that the actuation of the system through the actuation key 2only occurs if the test command is connected and the door 13 of theextractable drawer 4 is closed. Thus, there will be no movement of theconnecting cables and the door 13 will be automatically locked.

Then, the actuation key 2 is returned to the test position, turning offthe power input, at this stage necessarily with the door 13 closed,releasing the locks of the door 13 and of the test command.

Finally, it returns to the “disconnected” position by turning off thecommand, said operation is possible only and exclusively if the powerinput is disconnected.

The extractable drawer 4 also provides a mounting plate of components11, positioned transversally.

The power transmission assembly and the mechanical lock assembly areconstituted by a safety device 1, a gear assembly 6 and finally by anassembly of laminar plates 5 and 5A provided with elements thatinterconnect to the connectors for the actuation/locking of the systemwith the bus bars 12.

The safety device 1 is positioned in the door 13 of the extractabledrawer 4 and is formed by a frame 10 of fixing and finishing of thesafety device 1, opposite to which is positioned a drive bushing 9, thisin turn, is fitted axially in a body 7 of the safety device 1, whichprovides a guide tab 23 and, fitted in the back section of this body 7is positioned a coupling tab 8 of the drawer and the safety lockactuation.

On the other hand, the gear assembly 6 interconnected to the lockassembly, presents internally a central pendulous element 6A flanked byat least one gear 6B, 6C, passible of actuating the connection point forthe test device, or still, actuating the connection point of the powerinput 15 or both.

Internal additional elements of the gear assembly 6 are spring elements6F that permit the full functioning of all elements, in a precisely andadjusted way, being that each one of the gear assembly 6 presents ahousing 6E in which these spring elements 6F are positioned.

The back face of the gear assembly 6 presents an ergonomic section 6Hnotably designed to receive the fingers of the operator, allowing themanual movement of the extractable drawer 4 when required.

The front face of the gear assembly 6 presents two small guide tabs 6Dparallel to each other, positioned vertically, holding between them aninterstice of housing for a third tab called guide tab 23, provided inthe back section of the body 7 of the safety device 1, this beingpositioned in the back section of the lock assembly and fitting betweenthe tabs 6D of the gear assembly 6, being said device designed tomaintaining interlocked the whole safety device 1 and gear assembly 6.

Furthermore, the front face of the gear assembly 6 presents a centralhole 24, which houses a switch 25 that receives the end of a specialactuation key 2 for the actuation of the system, wherein said actuationkey 2 is provided with a small salience that presses a small button 6Gcoupled to said switch 25, which when pressed by the salience in the endof the special actuation key 2, allows to rotate the referred actuationkey 2, in conjunction with the pressing of the locking device 3 or theexternal button of safety, which is positioned next to the specialactuation key 2, actuating the test device and then, by pressing againthe locking device 3, allows to rotate the actuation key 2 to actuatethe assembly of the power input 15 of the equipment where theextractable drawer 4 of the MCC cabinet is connected.

The locking device 3 presents a hole 26, which is designed to receive asafety padlock, the said padlock locks the entire assembly and preventsfrom being manipulated without permission.

It should be noted that the term “comprising” does not exclude otherelements or steps and the use of articles “a” or “an” does not exclude aplurality. Also elements described in association with differentembodiments may be combined. It should also be noted that referencesigns in the claims should not be construed as limiting the scope of theclaims.

1-29. (canceled)
 30. A safety device for the locking and actuation ofelectrical connectors provided in an extractable drawer for a MCCcabinet, wherein the actuation and the locking of the electricalconnectors with their corresponding bus bars, comprising: a power mainconnector and a test connector, actuated through a mechanical movementof the safety device assembly, which include an autonomous safety devicecoupled to a door, which is actuated by a means of an actuation key witha locking device, a gear assembly, and at least two laminar plates,wherein the actuation key is connected to the gear assembly properlyarranged in a frontal section of the extractable drawer, behind thesafety device, wherein the gear assembly is in turn, connected to the atleast two lower laminar plates, which are connected to the power mainconnector and the test connector; wherein the at least two laminarplates are strategically positioned on a lower face of the extractabledrawer for the MCC cabinet and are provided with a plurality of smalloblong cutouts, further wherein small guide pins are fitted and arrangedin a base of the extractable drawer, which is formed in a single piece,the at least two laminar plates are provided with at least two smalllaminar tabs, which are orthogonal extensions of the at least twolaminar plates and, being these orthogonal to its plane and inserted inguide cutouts; wherein the at least two laminar plates are provided witha plurality of small rectangular cutouts aligned with each other andpassable of receiving the gear teeth provided in the gear assembly. 31.The safety device according to claim 30, wherein a test device isactuated in a first movement of the actuation key of the extractabledrawer, concomitant with pressing the locking device.
 32. The safetydevice according to claim 30, wherein the power main connector isactuated in a second movement of the actuation key of the system alongwith a new actuation of the locking device.
 33. The safety deviceaccording to claim 30, wherein the safety device allows an actuation ofthe system only in a secure environment.
 34. The safety device accordingto claim 30, wherein the actuation of the test device and the actuationof the power main connector, occur with the door of the extractabledrawer locked in a closed position.
 35. The safety device according toclaim 30, wherein an unlocking of the door of the extractable draweroccurs in the actuation of the test command.
 36. The safety deviceaccording to claim 30, wherein the door of the extractable drawer lockswhen the main power connector is actuated.
 37. The safety deviceaccording to claim 30, wherein in order to access an interior of theextractable drawer and to be possible to turn on or off the equipmentconnected to the MCC cabinet, to perform maintenance, first, theactuation key is inserted, positioning the system in test mode, turningon the test command which occurs with the door opened.
 38. The safetydevice according to claim 30, wherein in order to access an interior ofthe extractable drawer and to be possible to turn on or off theequipment connected to the MCC cabinet, to perform maintenance, first,the actuation key is inserted, positioning the system in the test mode,turning on the test command which can occur with the door closed. 39.The safety device according to claim 30, wherein in order to access aninterior of the extractable drawer and to be possible to turn on or offthe equipment connected to the MCC cabinet, to perform maintenance,first, the actuation key is inserted, positioning the system in the testmode, turning on the test command which can occur only with the doorclosed.
 40. The safety device according to claim 30, wherein theactuation of the system through the actuation key only occurs if thetest command is connected and the door of the extractable drawer isclosed.
 41. The safety device according to claim 30, wherein when theactuation key returns from the actuation position of a power socket tothe test position, the door is released.
 42. The safety device accordingto claim 30, wherein a return to the disconnected position, occurs byturning off the command of the test position, being this operationpossible only and exclusively if the power input is disconnected. 43.The safety device according to claim 30, wherein the safety device ispositioned in the door of the extractable drawer and is formed by aframe of fixing and finishing of the safety device, opposite to which ispositioned a drive bushing, this in turn, is fitted axially in a body ofthe safety device, which provides a guide tab and, fitted in the backsection of this body is positioned a coupling tab of the drawer and thesafety lock actuation.
 44. The safety device according to claim 30,wherein the same reverse procedure occurs at the system shutdown, whenthe actuation key should move conversely.
 45. The safety deviceaccording to claim 30, wherein safety device for the locking andactuation of the electrical connectors arranged in the extractabledrawer for MCC cabinet, presents a degree of protection IP40 to IP55 andtheir compartmentalization forms up to, in accordance with the NR10requirements.
 46. The safety device according to claim 30, wherein thesealing and locking of the extractable drawer through a padlock or otherequivalent locking means are also possible when the compartment isempty, due to the operating system of the extractable drawer coupled tothe door.
 47. The safety device according to claim 30, wherein apositioner presents a specific encoding and has been developed fordifferent types of extractable drawers.
 48. The safety device accordingto claim 30, wherein a working mechanism of the extractable draweroccurs through oriented gears and operates sequentially throughmechanical interlocks.
 49. The safety device according to claim 30,wherein the gear assembly is interconnected to the lock assembly, andpresents internally, a central pendulous element flanked by at least onegear possible of actuating the connection point for the test device, orstill, actuating the connection point of the power input or both; theinternal additional elements of the gear assembly are constituted byspring elements, wherein each of the gear assembly presents a housing inwhich these spring elements are positioned; a back face of the gearassembly presents an ergonomic section and a front face of the gearassembly presents two small guide tabs parallel to each other,positioned vertically, holding between them an interstice of housing forguide tab, provided in a back section of a body of the safety device,this being positioned in a back section of the lock assembly and fittingbetween the tabs of the gear assembly; the front face of the gearassembly presents a central hole, which houses a switch that receivesthe end of the actuation key for the actuation of the system, whereinthe actuation key is provided with a small salience that presses a smallbutton coupled to the switch which when pressed by the salience in theend of the actuation key, in conjunction with the pressing of thelocking device or the external button of safety, which is positionednext to the actuation key, rotates the actuation key and then, bypressing again the locking device, rotates the actuation key actuatingthe assembly of the power input of the equipment where the extractabledrawer of the MCC cabinet is connected.
 50. The safety device accordingto claim 30, wherein the locking device presents a hole which is areceptor of a safety padlock.
 51. The safety device according to claim30, wherein by pressing the locking device and doing the first rotationof the actuation key, a first small laminar plate of the at least twolaminar plates, responsible for the actuation or locking of the testsocket, is moved; the door of the extractable drawer remains closed andlocked, being passible to be released laterally by a second rotation ofthe actuation key.
 52. The safety device according to claim 30, whereinby pressing the locking device, the second rotation is executed, movinga second large laminar plate of the at least two laminar platesresponsible for the connection or disconnection of the power socket,being that the door of the extractable drawer is closed and locked,becoming passible to be released laterally by the actuation key.
 53. Thesafety device according to claim 30, wherein by pressing the lockingdevice, the second inverted rotation of the door which is closed andlocked, is executed, becoming passible to be released laterally by theactuation key.
 54. The safety device according to claim 30, wherein bypressing the locking device, the first inverted rotation of the doorwhich is closed and locked, is executed, becoming passible to bereleased laterally by the actuation key.
 55. The safety device accordingto claim 30, wherein the test connector of the system is released,primarily through the actuation key after the actuation of theconnectors of the test command and then, the entire system is releasedthrough the same actuation key, through a sequential movement, actuatingthe main connectors in the bus bars of the electrical system of theequipment coupled to the MCC cabinet, turning on all the equipment,being that these two steps, the actuation of the test device and theactuation of the main connectors, occur with the door of the extractabledrawer locked in the “closed” position.
 56. The safety device accordingto claim 30, wherein unlocking of the extractable drawer occurs in theactuation of the test command and, posteriorly and in the sequence, themain connection command of the bus bars of the system is actuated and,at this moment, the latch locks the door of the extractable drawer. 57.The safety device according to claim 30, wherein the actuation key ofthe main equipment is actuated, which only occurs if the test command isconnected and the door of the extractable drawer is closed, and havingno movement of the connecting cables, the door will be automaticallylocked; the actuation key is returned to the test position, turning offthe power input, at this stage necessarily with the door closed,releasing the locks of the door and of the test command, and finally,returning to a disconnected position by turning off the command, theoperation is possible only and exclusively if the power input isdisconnected.